鲁科学家导读:
※ 引述《okura (大仓)》之铭言：
: 1.媒体来源:
: 英国dailymail
: 2.完整新闻标题:
: Is deep space travel a step closer to reality? Nasa reveals successful test
: of 'impossible' fuel-free engine that breaks the laws of physics
: 3.完整新闻内文:
: 摘要:
: EM Drive Fuel-free engine could take a spacecraft to Mars in 10 weeks.
: Creates thrust by bouncing microwaves in chamber, using solar power.
: Nasa has conducted more tests using an improved experimental process.
: Test designed to remove errors from earlier study but still produced thrust.
: Scientists still aren't sure how this happens as it defies the laws of physics.
: 全文:
: An 'impossible' fuel-free engine, which could take a humans to Mars in just
: 10 weeks, is still defying science after another batch of tests by Nasa
: suggested the thruster does work.
: The so-called EM Drive creates thrust by bouncing microwaves around in an
: enclosed chamber, and uses only solar power.
: When the concept was first proposed, it was considered implausible because it
: went against the laws of physics - and subsequent tests of the engine have
: shown that the idea could revolutionise space travel.
: March posted on the Nasa Spaceflight forum in reply to an unpublished paper
: that claims the unaccounted thrust is generated by something known as the
: Lorentz force.
EM Drive原理宣称是利用劳伦兹力产生产生冲力
: The Lorentz force is the force that is exerted by a magnetic field on a
: moving electric charge.
劳伦兹力是磁场作用在移动电荷上的磁力
各位修过普通物理, 应该知道移动电荷在磁场受力
_ _ _ _ _
F=q (v x B) = q [(ds/dt) xB ]
但是要让太空船加速, 此磁力必须作功来产生动能
_ _ _ _ _ _ _ _
W= F.s = q (v x B). s = q [(ds/dt) xB ]. s = 0
而磁力跟位移的外积, 再跟位移取内积必为零
所以磁力必不做功!!
这则新闻里提到动力来源是罗伦兹力, 肯定是错的
看到这边, 已经可以知道这则新闻必定是唬烂